Closed-loop demodulation all-fiber current transformer and large-current waveform hopping problem solving method thereof

A current transformer, all-fiber technology, applied in the direction of measuring current/voltage, only measuring current, measuring electrical variables, etc., to reduce the measurement error, improve the dynamic measurement range, and stabilize the output power.

Pending Publication Date: 2020-03-27
SOUTHEAST UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems raised by the above-mentioned background technology, the present invention proposes a solution to the closed-loop demodulation all-fiber-optic current transformer and its large current waveform jumping problem

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  • Closed-loop demodulation all-fiber current transformer and large-current waveform hopping problem solving method thereof
  • Closed-loop demodulation all-fiber current transformer and large-current waveform hopping problem solving method thereof
  • Closed-loop demodulation all-fiber current transformer and large-current waveform hopping problem solving method thereof

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Embodiment Construction

[0034] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] Such as figure 1As shown, a closed-loop demodulation all-fiber-optic current transformer includes an all-fiber-optic current transformer and a closed-loop demodulation device; the all-fiber-optic current transformer includes a light source generator 1, a coupler 2, a polarizer 3, a phase modulation device 4, polarization maintaining fiber 5, 1 / 4 wave plate 6, mirror 7 and sensing fiber 8; the closed-loop demodulation device includes detector 9, A / D converter 10, signal processing unit 11 and D / A Converter 13.

[0036] The light emitted by the light source generator enters the polarizer through the coupler to form linearly polarized light. The polarizer and the phase modulator are welded at an angle of 45°. The intersecting linearly polarized light is transmitted along the fast and slow axes of the polarization-maintaining fiber res...

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Abstract

The invention discloses a closed-loop demodulation all-fiber current transformer and a large-current waveform hopping problem solving method thereof. According to the closed-loop demodulation all-fiber current transformer, a closed-loop demodulation device is added to an existing reflective current transformer. Meanwhile, for the closed-loop demodulation all-fiber current transformer, two solutions for solving the problem of large-current waveform hopping are designed, so that the measurement error of the system is reduced, the dynamic measurement range of the system is expanded, and the composite error test requirement of the multi-turn sensing ring in the case of large current is met.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a closed-loop demodulation all-fiber current transformer. Background technique [0002] For a long time, electromagnetic transformers have been playing an important role in power system operation monitoring. The measurement monitoring and protection control in the substation rely on it to obtain the current, voltage and other information required for measurement, measurement and protection. With the increase of grid voltage and the development of intelligent primary and secondary equipment, traditional electromagnetic transformers have gradually exposed their own shortcomings, such as weak electrical insulation, bulky size, small dynamic range, iron core saturation, iron Magnetic resonance overvoltage, etc. [0003] With the in-depth development of substation automation technology, a new type of intelligent primary equipment has emerged in which primar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/24
CPCG01R15/24G01R19/0092
Inventor 赵俊姜琦孙小菡
Owner SOUTHEAST UNIV
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